package com.itheima.sh.filter;

import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Description:
 * @Version: V1.0
 */
//@Component
//@Order(-1)  // 值越小越优先执行
public class LoginFilter implements GlobalFilter, Ordered {
    /**
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1 获取 request 对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        // 2 得到前端传递 token 参数
        String token = request.getQueryParams().getFirst("token");
        // 2.1 没有token 或 token不为 admin   拦截
        if (StringUtils.isBlank(token) || !"admin".equals(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);  // 未授权
            return response.setComplete();
        }

        // 2.2 admin 则放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
